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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Engineering the diversity of polyesters.

De-Chuan Meng1, Rui Shen1, Hui Yao1

  • 1MOE Key Lab of Bioinformatics, School of Life Science, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.

Current Opinion in Biotechnology
|March 18, 2014
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Summary
This summary is machine-generated.

Engineered bacteria can now controllably synthesize diverse polyhydroxyalkanoates (PHA) biopolyesters, including functionalized polymers, by modifying their metabolic pathways and using fatty acids as precursors.

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Area of Science:

  • Microbial biotechnology
  • Polymer chemistry
  • Synthetic biology

Background:

  • Bacteria naturally produce polyhydroxyalkanoates (PHA) biopolyesters, but controlling their structure (homopolymers, copolymers, monomer ratios) is challenging.
  • Existing methods offer limited control over PHA architecture, hindering the development of tailored biomaterials.

Purpose of the Study:

  • To engineer bacterial strains for the controllable synthesis of diverse PHA structures, including functionalized polymers.
  • To explore novel PHA synthesis pathways for precise control over polymer composition and architecture.

Main Methods:

  • Engineered new PHA synthesis pathways in bacteria, specifically modifying the β-oxidation cycle in Pseudomonas putida and Pseudomonas entomophila.
  • Utilized fatty acids, including those with functional groups, as precursors for PHA synthesis.
  • Investigated the impact of metabolic engineering on PHA structure and monomer incorporation.

Main Results:

  • Achieved controllable synthesis of various PHA structures, including homopolymers, random copolymers, and block copolymers, with precise monomer ratios.
  • Enabled the production of functional PHA by incorporating functional groups into polymer chains via uptake of functionalized fatty acids.
  • Demonstrated the potential for further PHA modification through grafting onto functional PHA side chains.

Conclusions:

  • Metabolic engineering of bacteria provides a powerful platform for the precise and controllable synthesis of diverse PHA biopolyesters.
  • The ability to create functionalized PHA opens new avenues for developing advanced biomaterials with tailored properties for various applications.
  • This approach significantly expands the diversity of PHA structures achievable, paving the way for novel biopolymer applications.